H = quiversc(.) returns the quiver object handle h. Quiversc(.,'Name',Value) specifies property name and property value pairs for the quiver objects the function creates. Quiversc(.,LineSpec,'filled') fills markers specified by LineSpec. quiversc draws the markers at the origin of the vectors. Quiversc(.,LineSpec) specifies line style, marker symbol, and color using any valid LineSpec. You can also tune the length of arrows after they have been drawn by choosing the Plot Edit tool, selecting the quiver object, opening the Property Editor, and adjusting the Length slider. Use scale = 0 to plot the velocity vectors without automatic scaling. scale = 2 doubles their relative length, and scale = 0.5 halves the length. Quiversc(.,scale) automatically scales the length of the arrows to fit within the grid and then stretches them by the factor scale. Default DensityFactor is 50, meaning hypot(Nrows,Ncols)=50, but if your plot is too crowded you may specify a lower DensityFactor (and/or adjust the markersize). The DensityFactor defines how many arrows are plotted. Quiversc(.,'density',DensityFactor) specifies density of quiver arrows. By default, the arrows are scaled to just not overlap, but you can scale them to be longer or shorter if you want. The matrices x, y, u, and v must all be the same size and contain corresponding position and velocity components. Not easy to spot the difference with images here, but we can see that indeed, there is anti-aliasing on arrow end in mine and not in yours.Quiversc(x,y,u,v) plots vectors as arrows at the coordinates specified in each corresponding pair of elements in x and y. In other words, it ends up like drawing 1 single arrow without anti-aliasing. Which makes some pixels semi-transparent, to create an anti-aliasing independent from the background.īut if you draw 100 times the exact same arrow, with the exact same semi-transparent anti-aliasing pixels, you get something more binary: either a pixels is drawn, or it is not. Simply, there is an anti-aliasing when you draw something. So it is not like there was noise on arrow position or anything. Reduce the low quality impression you get when you draw 100 times the same arrow at the same place. Maybe this 100 arrows is a rest of a previous attempt to draw all of them without for loops.īut, in the meantime replacing ax.quiver(y/m,x/m, np.zeros(n), B, B, B, length=0.1, normalize=True, color='purple')īy ax.quiver(y/m,x/m, 0, B, B, B, length=0.1, normalize=True, color='purple') I don't really follow your code, nor why you would use a for loop to draw arrows one by one. #ax.plot3D(, color='purple')Īx.quiver(y/m,x/m, np.zeros(n), B, B, B, length=0.1, normalize=True, color='purple')Įach arrow is 100 arrows. The arrows in the plot seem to be of very low resolution, any suggestions on how to improve this? I'm trying to create a 3D plot showing fields lines going through a surface which can be tilted using Python.įor the field lines, I wish to create them based on a field vector, displayed using quiver.
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